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Ubiquiti UniFi mDNS Auto Discover Issue

If mDNS is unchecked then Home Assistant and ESPHome will not auto discover new devices

If you have different networks that Homey and ESPHome devices are on, then you will need mDNS working across both networks and firewall rules allowing access between them. Below are guides for using your PC and the UniFi iOS app to fix this issue.

Method 1: Browser

1. Log into your UniFi network through your default IP address which is usually http://192.168.1.1

2. Select Network.

UniFi OS Applications page with the Network application highlighted

3. Select Settings.

UniFi Network sidebar with the Settings gear icon highlighted

4. Select Networks.

UniFi Network settings menu with Networks highlighted

5. Select the Default Network

UniFi Networks list with the Default network highlighted

6. Check Multicast DNS

UniFi Default network settings with the Multicast DNS checkbox checked and highlighted

7. Now the Home Assistant/ESPHome auto-discover issue should be fixed!

Method 2: UniFi iOS App.

1. Open the UniFi app.

UniFi Network app icon circled in the phone's app search results

2. Tap Settings/Gear Icon

UniFi Network app Settings screen with the gear icon circled in the bottom bar

3. Tap Networks

UniFi Network app Settings screen with Networks circled

4. Tap Default Network

UniFi Network app Networks list with the Default network circled

5. Tap the Multicast DNS slider

UniFi Network app Edit Default screen with the Multicast DNS toggle turned on and circled

6. Now the Home Assistant/ESPHome auto-discover issue should be fixed!